Thread: Article: VF-Engineering MAFless E46 M3 Stage II S54 supercharger kit tuning and dynograph - A look at MAF/MAP sensor and Alpha-N supercharger tuning
03-26-2014, 06:24 PM #1
VF-Engineering MAFless E46 M3 Stage II S54 supercharger kit tuning and dynograph - A look at MAF/ MAP sensor and Alpha-N supercharger tuning
Those who have followed the E46 M3 aftermarket and forced induction market since its early days likely know that VF-Engineering's tuning approach was questioned quite a bit. Since those early days VF-Engineering has made changes to its tuning options and they continue to revise them. This VF-Engineering E46 M3 supercharger kit features MAFless tuning which is essentially tuning without the mass air flow meter that is removed.
The S65 V8 in the E92 M3 is mafless to begin with instead using a MAP (mass air pressure) sensor to detect intake airflow. In a forced induction setup the MAP sensor can detect air pressure in the manifold which certainly is useful. A MAP sensor will traditionally measure vacuum and pressure.
The MAF sensor on the other hand senses air flow. To break it down however much air passes by the sensor is what it reports. In certain situations the air flow may not be the exact CFM (cubic feet per minute) of air going into the motor which can complicate MAF tuning.
Both approaches are used and there are pluses and minuses but since a MAP sensor uses the actual pressure instead of flow even if a boost hose blows off or there is pressure loss a good tune should be able to compensate better than a MAF setup in such a situation. Additionally, the MAF may pose a physical restriction in the air intake tract. Throttle response also can be improved with MAFless tuning.
VF-Engineering made the switch to an in-house MAFless tune tailored for their intercooled kits (the entry level non-intercooled supercharger kit is still MAF tuned as BimmerBoost understands it) and the results have been positive. Why is this important? Because it goes to show how marketing quickly changes. This was VF-Engineering's stance when they were tuning with the MAF sensor:
Originally Posted by VF-Engineering
Video with dyno below, 471 wheel horsepower:
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03-26-2014, 08:07 PM #2